<?php
namespace common\models;

use yii\base\Model;

class Tree extends Model
{
    /**
	 * 生成树型结构所需要的2维数组
	 * @var array
	 */
    public $arr = array();
	
	/**
	 * 生成树型结构所需修饰符号，可以换成图片
	 * @var array
	 */
	public $icon = array('│','├─ ','└─ ');
	public $nbsp = "&nbsp;";

	/**
	 * @access private
	 */
    public $ret = '';
	
	/**
	 * 构造函数，初始化类
	 * @param array 2维数组，例如：
	 * array(
	 *      1 => array('id'=>'1','parentid'=>0,'name'=>'一级栏目一'),
	 *      2 => array('id'=>'2','parentid'=>0,'name'=>'一级栏目二'),
	 *      3 => array('id'=>'3','parentid'=>1,'name'=>'二级栏目一'),
	 *      4 => array('id'=>'4','parentid'=>1,'name'=>'二级栏目二'),
	 *      5 => array('id'=>'5','parentid'=>2,'name'=>'二级栏目三'),
	 *      6 => array('id'=>'6','parentid'=>3,'name'=>'三级栏目一'),
	 *      7 => array('id'=>'7','parentid'=>3,'name'=>'三级栏目二')
	 *      )
	 */
	public function init($arr=array()){
        $this->arr = $arr;
        $this->ret = '';
        return is_array($arr);
    }

	/**
	 * 得到父级数组
	 * @param int
	 * @return array
	 */
	public function get_parent($myid){
		$newarr = array();
		if(!isset($this->arr[$myid])) return false;
		$pid = $this->arr[$myid]['parentid'];
		$pid = $this->arr[$pid]['parentid'];
		if(is_array($this->arr)){
			foreach($this->arr as $id => $a){
				if($a['parentid'] == $pid) $newarr[$id] = $a;
			}
		}
		return $newarr;
	}

    /**
	 * 得到子级数组
	 * @param int
	 * @return array
	 */
	public function get_child($myid){
		$a = $newarr = array();
		if(is_array($this->arr)){
			foreach($this->arr as $id => $a){
				if($a['parentid'] == $myid) $newarr[$id] = $a;
			}
		}
		return $newarr ? $newarr : false;
	}

    /**
	 * 得到当前位置数组
	 * @param int
	 * @return array
	 */
	public function get_pos($myid,&$newarr){
		$a = array();
		if(!isset($this->arr[$myid])) return false;
        $newarr[] = $this->arr[$myid];
		$pid = $this->arr[$myid]['parentid'];
		if(isset($this->arr[$pid])){
		    $this->get_pos($pid,$newarr);
		}
		if(is_array($newarr)){
			krsort($newarr);
			foreach($newarr as $v){
				$a[$v['id']] = $v;
			}
		}
		return $a;
	}

    /**
	 * 得到树型结构
	 * @param int ID，表示获得这个ID下的所有子级
	 * @param string 生成树型结构的基本代码，例如："<option value=\$id \$selected>\$spacer\$name</option>"
	 * @param int 被选中的ID，比如在做树型下拉框的时候需要用到
	 * @return string
	 */
	public function get_tree($myid, $str, $sid = 0, $adds = '', $str_group = ''){
		$number=1;
		$child = $this->get_child($myid);
		if(is_array($child)){
		    $total = count($child);
			foreach($child as $id=>$value){
				$j=$k='';
				if($number==$total){
					$j .= $this->icon[2];
				}else{
					$j .= $this->icon[1];
					$k = $adds ? $this->icon[0] : '';
				}
				$spacer = $adds ? $adds.$j : '';
				
				@extract($value);
				$selected = $id==$sid ? 'selected' : '';
				$parentid == 0 && $str_group ? eval("\$nstr = \"$str_group\";") : eval("\$nstr = \"$str\";");
				$this->ret .= $nstr;
				$nbsp = $this->nbsp;
				$this->get_tree($id, $str, $sid, $adds.$k.$nbsp,$str_group);
				$number++;
			}
		}
		return $this->ret;
	}
    /**
	 * 同上一方法类似,但允许多选
	 */
	public function get_tree_multi($myid, $str, $sid = 0, $adds = ''){
		$number=1;
		$child = $this->get_child($myid);
		if(is_array($child)){
		    $total = count($child);
			foreach($child as $id=>$a){
				$j=$k='';
				if($number==$total){
					$j .= $this->icon[2];
				}else{
					$j .= $this->icon[1];
					$k = $adds ? $this->icon[0] : '';
				}
				$spacer = $adds ? $adds.$j : '';
				
				$selected = $this->have($sid,$id) ? 'selected' : '';
				@extract($a);
				eval("\$nstr = \"$str\";");
				$this->ret .= $nstr;
				$this->get_tree_multi($id, $str, $sid, $adds.$k.'&nbsp;');
				$number++;
			}
		}
		return $this->ret;
	}
	
	/**
	 * 获取子栏目json
	 * Enter description here ...
	 * @param unknown_type $myid
	 */
	public function creat_sub_json($myid, $str='') {
		$sub_cats = $this->get_child($myid);
		$n = 0;
		if(is_array($sub_cats)) foreach($sub_cats as $c) {			
			$data[$n]['id'] = iconv(CHARSET,'utf-8',$c['catid']);
			if($this->get_child($c['catid'])) {
				$data[$n]['liclass'] = 'hasChildren';
				$data[$n]['children'] = array(array('text'=>'&nbsp;','classes'=>'placeholder'));
				$data[$n]['classes'] = 'folder';
				$data[$n]['text'] = iconv(CHARSET,'utf-8',$c['catname']);
			} else {				
				if($str) {
					@extract(array_iconv($c,CHARSET,'utf-8'));
					eval("\$data[$n]['text'] = \"$str\";");
				} else {
					$data[$n]['text'] = iconv(CHARSET,'utf-8',$c['catname']);
				}
			}
			$n++;
		}
		return json_encode($data);		
	}
	private function have($list,$item){
		//echo $list.'----'.$item.'<br>';
		return(strpos(',,'.$list.',',','.$item.','));
	}

}